TSpectrum reference update

Hi,

could you please update ref 3 in TSpectrum.c with

Morhac M, Kliman J, Matousek V, et al. Identification of peaks in multidimensional coincidence gamma-ray spectra NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 443 (1): 108-125 MAR 21 2000

Janos